Appeal No. 1997-4116 Page 4
Application No. 08/589,826
If a preferred SI is to be taken off-line, data in the
preferred SI must first be copied to a non-preferred SI that
will remain on-line. Accordingly, there must exist a non-
preferred SI to which the data in the preferred SI to be taken
off-line can be copied.
The invention increases the likelihood of finding a
target SI to use in copying pages from a preferred SI when the
latter is being taken off-line. Specifically, the invention
employs an indicator to mark a page frame as permanently non-
preferred (PNP). A bad page frame is a page frame that
contains an uncorrectable storage error. Upon identification
of a bad page frame in one of the SIs, the corresponding page
frames in the other SIs are marked as PNP so that the latter
cannot hold fixed data.
Claim 12, which is representative for our purposes,
follows:
12. A method for enhancing the likelihood of
successful off-line reconfiguration of one of two or
more reconfigurable storage entities in a system
comprising one or more central processing units,
real storage linked to said one or more central
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